mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 16:25:04 +02:00
208 lines
5.5 KiB
C
208 lines
5.5 KiB
C
/*
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* Cryo Interactive Entertainment HNM4 demuxer
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*
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* Copyright (c) 2012 David Kment
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*
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* This file is part of FFmpeg .
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg ; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#define HNM4_TAG MKTAG('H', 'N', 'M', '4')
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#define HNM4_SAMPLE_RATE 22050
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#define HNM4_FRAME_FPS 24
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#define HNM4_CHUNK_ID_PL 19536
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#define HNM4_CHUNK_ID_IZ 23113
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#define HNM4_CHUNK_ID_IU 21833
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#define HNM4_CHUNK_ID_SD 17491
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typedef struct Hnm4DemuxContext {
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uint8_t version;
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uint16_t width;
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uint16_t height;
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uint32_t filesize;
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uint32_t frames;
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uint32_t taboffset;
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uint16_t bits;
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uint16_t channels;
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uint32_t framesize;
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uint32_t currentframe;
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int64_t pts;
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uint32_t superchunk_remaining;
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AVPacket vpkt;
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} Hnm4DemuxContext;
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static int hnm_probe(AVProbeData *p)
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{
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if (p->buf_size < 4)
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return 0;
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// check for HNM4 header.
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// currently only HNM v4/v4A is supported
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if (AV_RL32(&p->buf[0]) == HNM4_TAG)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int hnm_read_header(AVFormatContext *s)
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{
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Hnm4DemuxContext *hnm = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *vst;
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/* default context members */
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hnm->pts = 0;
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av_init_packet(&hnm->vpkt);
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hnm->vpkt.data = NULL;
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hnm->vpkt.size = 0;
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hnm->superchunk_remaining = 0;
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avio_skip(pb, 8);
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hnm->width = avio_rl16(pb);
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hnm->height = avio_rl16(pb);
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hnm->filesize = avio_rl32(pb);
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hnm->frames = avio_rl32(pb);
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hnm->taboffset = avio_rl32(pb);
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hnm->bits = avio_rl16(pb);
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hnm->channels = avio_rl16(pb);
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hnm->framesize = avio_rl32(pb);
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avio_skip(pb, 32);
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hnm->currentframe = 0;
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if (hnm->width < 256 || hnm->width > 640 ||
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hnm->height < 150 || hnm->height > 480) {
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av_log(s, AV_LOG_ERROR,
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"invalid resolution: %ux%u\n", hnm->width, hnm->height);
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return AVERROR_INVALIDDATA;
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}
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// TODO: find a better way to detect HNM4A
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if (hnm->width == 640)
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hnm->version = 0x4a;
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else
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hnm->version = 0x40;
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if (!(vst = avformat_new_stream(s, NULL)))
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return AVERROR(ENOMEM);
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codec->codec_id = AV_CODEC_ID_HNM4_VIDEO;
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vst->codec->codec_tag = 0;
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vst->codec->width = hnm->width;
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vst->codec->height = hnm->height;
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vst->codec->extradata = av_mallocz(1);
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vst->codec->extradata_size = 1;
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memcpy(vst->codec->extradata, &hnm->version, 1);
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vst->start_time = 0;
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avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS);
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return 0;
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}
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static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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Hnm4DemuxContext *hnm = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret = 0;
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uint32_t superchunk_size, chunk_size;
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uint16_t chunk_id;
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if (hnm->currentframe == hnm->frames || pb->eof_reached)
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return AVERROR_EOF;
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if (hnm->superchunk_remaining == 0) {
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/* parse next superchunk */
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superchunk_size = avio_rl24(pb);
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avio_skip(pb, 1);
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hnm->superchunk_remaining = superchunk_size - 4;
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}
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chunk_size = avio_rl24(pb);
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avio_skip(pb, 1);
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chunk_id = avio_rl16(pb);
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avio_skip(pb, 2);
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if (chunk_size > hnm->superchunk_remaining || !chunk_size) {
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av_log(s, AV_LOG_ERROR,
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"invalid chunk size: %"PRIu32", offset: %"PRId64"\n",
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chunk_size, avio_tell(pb));
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avio_skip(pb, hnm->superchunk_remaining - 8);
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hnm->superchunk_remaining = 0;
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}
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switch (chunk_id) {
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case HNM4_CHUNK_ID_PL:
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case HNM4_CHUNK_ID_IZ:
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case HNM4_CHUNK_ID_IU:
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avio_seek(pb, -8, SEEK_CUR);
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ret += av_get_packet(pb, pkt, chunk_size);
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hnm->superchunk_remaining -= chunk_size;
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if (chunk_id == HNM4_CHUNK_ID_IZ || chunk_id == HNM4_CHUNK_ID_IU)
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hnm->currentframe++;
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break;
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case HNM4_CHUNK_ID_SD:
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avio_skip(pb, chunk_size - 8);
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hnm->superchunk_remaining -= chunk_size;
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break;
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default:
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av_log(s, AV_LOG_WARNING, "unknown chunk found: %"PRIu16", offset: %"PRId64"\n",
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chunk_id, avio_tell(pb));
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avio_skip(pb, chunk_size - 8);
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hnm->superchunk_remaining -= chunk_size;
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break;
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}
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return ret;
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}
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static int hnm_read_close(AVFormatContext *s)
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{
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Hnm4DemuxContext *hnm = s->priv_data;
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if (hnm->vpkt.size > 0)
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av_free_packet(&hnm->vpkt);
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return 0;
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}
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AVInputFormat ff_hnm_demuxer = {
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.name = "hnm",
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.long_name = NULL_IF_CONFIG_SMALL("Cryo HNM v4"),
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.priv_data_size = sizeof(Hnm4DemuxContext),
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.read_probe = hnm_probe,
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.read_header = hnm_read_header,
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.read_packet = hnm_read_packet,
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.read_close = hnm_read_close,
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.flags = AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH
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};
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